1999 Mitsubishi Diamante Visibility (wipers, defrost, mirrors) Problems
- Complaints
- 11about this part
- Share
- 48%of 23 total for the year
- Median mileage
- 86,000miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 11 complaints about the visibility of the 1999 Mitsubishi Diamante, 48% of the 23 complaints for this model year. Where a mileage was given, the median is 86,000 miles.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“The windows fog up so bad that it becomes hard to see. The vents spew out the pungent smell of anti-freeze. I have noticed on more than a few occasions that puffs of vapor shoot out from under the passenger side dash and vents. I know that anti-freeze is poisonous to humans and don't think that its safe for me to be driving the vehicle when I have to breath in the vapors.”
NHTSA complaint #10160835, filed 2006-06, 60,000 miles“I own a 1999 Mitsubishi Diamante with 87k miles on the odometer. My wife was driving the vehicle last week and noticed that the windows of the car started to fog up. The fogging became so thick that she had to pull over (blindly) and frantically wipe the window clean in order to see out of the car. She had to cancel her trip short because the problem kept recurring the car also started to smell like anti-freeze, which, according to my wife, continued to get stronger as she drove it home. …”
NHTSA complaint #10150285, filed 2006-02, 86,900 miles“My heater core is faulty, my defogger wont work, and it is emitting some terrible fumes in the car, also anti freeze is leaking on the front passenger floor.”
NHTSA complaint #10157523, filed 2006-05, 145,000 miles“I'm experiencing a syrupy smell inside the car when the heat is on. Per the various research I have performed, this is a sign of a failing heater core. This is a known failure by mits per TSB 627114 that was issued. Additionally, on >2000 model year diamantes, mits began putting the vehicle?s computer (ecu) in a plastic bag so that when the heater core does fail, it does not ruin the ecu and create additional safety risks. This is just another sign that mits is aware of the issue and rather than designing out the problem, they put a bandage over a potential effected area. …”
NHTSA complaint #10113881, filed 2005-03, 78,000 miles“Mitsubishi Diamante 1999: windshield started to get foggy, inside cabin smelled on coolant and occasional puffs of smoke evaporated out of the wents. This presented very dangerous driving conditions. Could not drive car for 2 months. Dealership diagnosed and wanted $1000 for the repair of the heater core. Due to the lack of money, I did it myself with proper instructions. Problem was in bad o-rings that caused coolant to leak into cabin and over important computer module. Half-year later, no smell, no wapor, no fog in the cabin. …”
NHTSA complaint #10086286, filed 2004-08, 70,000 milesRelated service bulletins
- 10170074Aug 28, 2015This is a service newsletter (Tech Talk) that was sent out to dealers.
- 10170087Dec 7, 2012This is a service newsletter (Tech Talk) that was sent out to dealers.
Visibility (wipers, defrost, mirrors): other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2003 | 28 | 50% |
| 2002 | 71 | 58% |
| 2001 | 56 | 72% |
| 2000 | 27 | 53% |
| 1999 | 11 | 48% |
| 1998 | 16 | 59% |
| 1997 | 3 | 9% |
| 1993 | 1 | 3% |
| 1992 | 4 | 10% |
Other parts of the 1999 Mitsubishi Diamante
3 complaintsEngine cooling
3 complaintsSuspension
3 complaintsFuel system
1 complaintsSeat belts
1 complaintsSeats
1 complaintsSteering
1 complaintsBody and structure
1 complaintsTires
1 complaints
← All problems reported for the 1999 Mitsubishi Diamante
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 31, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology